Rotary bolt lock



Dec. 4, 1934. FALK 1,983,446

ROTARY BOLT LOCK Filed Sept. 14, 1931 ii a.

' 4" Q/ MP? 1 uummmmummm v w mumumm..nl zi'lfliganuw 16 'Hu 5 nlllillu Patented Dec. 4, 1934 UNITED STATES PATENT OFFICE V i i 1,983,446

ROTARY BOLT Loon- Morris Falk, Leomins't'er, Mass, assignor to In-' dependent Look Fitchburg,- Mass., a cor poration of Massachusetts Application September 14, 1931, Serial No. 562,723"

4 Claims.

This invention relates to looks and is more especially concerned with locks of the swinging or rotary bolt type.

It is the chief object of the invention to improve locks of the type above mentioned with a view to increasing the security afforded by them while at the same time simplifying their construction and reducing the expense of manufacturing them.

The nature of the invention will be readily understood from the following description when read in connection with the accompanying drawing, and the novel features will be particularly pointed out in the appended claims. I

In the drawing,

Figure 1 is a front elevation of a lock constructed in accordance with this invention;

Fig. 2 is an edge view of the construction shown in Fig. 1;

Figs. 3 and 4 are bottom plan views of the lock showing the locking bolts in unlocking and looking positions, respectively, the bottom plate being removed in each View;

Fig. 5 is a sectional view approximately on the" line 5-5, Fig. 3;

Fig. 6 is a perspective view of the bottom plate for the casing,

Fig. 7 is a perspective view of the casing and some of the parts mounted therein; and

Fig. 8 is a perspective View of the plunger for actuating the locking bolts and the operating lever therefor.

The drawing shows the invention as embodied in a so-called jimmy proof type of .lock. It 3 includes a casing 2 designed to be secured to the inside of a door 3 by screws 4 in such a position that a part of the casing will project beyond the edge of the door. This projecting portion of the casing has two slots 5-5 formed in it to receive 49 hasps 6-6 which are secured rigidly to a base 7 of angular cross-sectional form and adapted to be fastened to the door frame or casing 8. When the hasps are located in the slots 5-5 they may be locked in this position by two rotary bolts 4 10-10. These bolts are of approximately circular or Ceshaped form and they are mounted in similarly shaped grooves formed in the casing 2 so that they can be rotated about their respective axes and in a plane substantially parallel to the door across the slots 5-5 into either locking position, as shown in Fig. 4, where portions of the bolts extend through the slots in the respective U-shaped hasps 6-6, or into an unlocking or releasing position, as shown in Fig. 3, where the edges of the gaps in the bolts register approximately with the walls of the slots 5-5.

The construction so far described is very similar to those which have been used heretofore. It will be appreciated from an inspection ofFig. 5 that it is possible with some door constructions fitted with locks of this type to insert a saw through the crack between the edge of the door 3 and the casing 8 and to cut down through the entire lock mechanism. The present invention deals particularly with this difficulty. It also provides a novel operating mechanism for the rotary bolts 10-10.

Referring more particularly to Figs. 3 and 4, it will be observed that a plunger 12 is mounted in the casing with its forward end overlying and resting upon the two bolts 10-10. This end of the plunger is slotted transversely to receive two pins 14-14 which are secured in and project upwardly from the. respective bolts 10-10. At its rearward end this plunger is slotted, as shown at 15, to ride on a stationary lug 16 which serves as a guide for the plunger. In addition, the plunger is provided at its forward end with'a downwardly extending rib 17, best shown in Fig. 8, which runs between the adjacent surfaces of the two bolts 10-10, these parts cooperating with .the lug 16 to guide the plunger for reciprocating movement in approximately a straight line.

The operating mechanism for the plunger 12 includes a lever 18, one end of which is pivoted to the plunger at 19, while its other end has a member 20 secured thereto which is provided with two U-shaped sockets 21 and 22, Fig. 8. A spring 23 acts on the lever 18 in a direction tending constantly to swing the free end of this lever downwardly, referring to the parts as shown in Figs. 3 and 4. A knob 24 which is rotatably mounted in the casing 2 has an arm 25 secured rigidly to its inner end and a pin 26 projects from this arm into the slot 21 in the member 20. A suitable key operated mechanism also is connected with the lever 18 and this mechanism may be of any suitable type. As shown, it consists of a pin cylinder 27 of a common type having a blade 28 extending from its inner end into a slot 30, Fig. 6, in a collar which is rotatably supported in the bottom plate 31 for the casing 2 and is rigidly secured at its inner side to an arm 32 provided with w a pin 33, this arm and pin being like those shown at 25 and 26. The pin 23 projects into the socket 22 of the member 20, as shown in Fig. 5.

It will be clear from an inspection of Fig. 3 that when the knob 24 is turned in a counter clockwise direction through an arc of approximately 180, it will operate through the members 20, 18 and 19 to slide the plunger 12 toward the left and thus to swing both of the bolts 10-10 into their locking positions. Fig. 4 shows the parts in their relative positions at the end of this movement. A similar rotation of the knob 24 in the opposite direction will then unlock the hasps. The lug 16 acts as a stop for the lever 18 at both extremes of its throw, and the spring 23 acts on the lever 18 to hold the pin 26 approximately in or slightly past the dead cented so that the plunger 12 is locked against return movement. The plunger may be similarly operated by inserting a proper key in the pin cylinder 27 and turning it to the P right or left.

The invention thus provides an operating mechanism for the rotary bolts which is extremely simple, is very sturdy and substantial, is positive in operation, and not liable to get out of order. In addition, the plunger 12 preferably is made of hardened steel or some other hardened metal which cannot be sawed. When this plunger is in position to hold the bolts 10-l0 in their locking relationship, it then projects across the plane of 4 the edge of the door 3. Also it overlaps both of the bolts 1010. Consequently, with this construction, it is impossible to insert a saw through the crack between the door and the casing and saw through the lock. Practical considerations make in necessary to manufacture the casing 2 and the bolts 10-10 from metals which can be cut with asaw, and an attempt of the character just described therefore would result in the saw cut: ting through the look from either above or below until it struck the plunger 12. Further sawing of the lock in either direction would be prevented by the hardened plunger. Because of the protective relationship of the plunger to the bolts 1010 it would be impossible to cut through them.

This'construction, therefore, adds very substantially to the security afforded by locks of this type.

While I have herein shown and described a preferred embodiment of my invention, itwill be evidentthat the invention will be embodied in otherforms without departing from the spirit" or scope thereof as set forth in the claims.

Having thus described my invention, what I desire to claim as new is:

1. In a lock, the combination of a casing provided with a slot to receive a hasp, a bolt mounted in said casing to swing about an axis into a position across said slot, a hardened plunger connected with said bolt for operating it, said plunger being arranged to overlie a portion of said bolt and protect the same from being sawed when the bolt is in its locking position, and means for operating said plunger.

2. In a lock, the combination of a casing provided With two slots spaced apart to receive hasps, two rotary locking bolts mounted in said casing to swing across said slots, a hardened plunger connected with both of said bolts to operate them, means for guiding said plunger for reciprocating movement, the connections between said bolts and said plunger being such that the plunger extends across the plane of the edge of the door to which said casing is secured when the plunger is in position to hold the bolts locked, and means for epers ating said plunger.

3. In a lock, the combination of a casing; provided with two slots spaced apart to receive hasps, two rotary locking bolts each having approxi-. mately a C-shape mounted in said casing to swing about their respective axes across said slots, a plungerhaving a pin and slot connection with both of said bolts for operating them, means for guiding said plunger for reciprocating movement in said casing, said plunger being arranged. to overlie portions of said bolts to protect them, andkey co ntrolled means for operating said plunger.

4. In a lock, the combination of a casing adapted to be secured to a door, said casing being provided with a slot to receive a hasp, a bolt mounted in said casing to swing in a plane approximately parallel to the door into a position across said slot, a hardened plunger connected with said bolt for operating it and arranged to extend into a. position in front of the locked portion of said, hasp when the bolt is in its locking position, and means for operating said plunger.

MORRIS, FALK. 

